Igneous rocks of Edinburgh: Blackford and Braid Hills

A circuit over two of Edinburgh’s Seven Hills, exploring the early volcanic history of Edinburgh. These hills are the remains of silica-rich lava flows and ash layers that represent a very explosive and dramatic episode of volcanic activity 410 million years ago. Blackford Hill is made of andesite, and the Braid Hills are made of an unusual type of igneous rock, trachyte, both formed during surface volcanic activity. These layers are part of a sequence of igneous rocks that continues into the Pentland Hills.

I have classified this as a moderate walk, on rough paths with climbing and some steps. It may be rough or slippery underfoot at times. It may be wet, windy or cold. Come equipped with strong footwear, waterproof clothing and something to eat and drink. Duration 3 hours, distance 8 km.

Meeting point

Meet by Lodge Coffee House, at the entrance to the Hermitage of Braid on Braid Road.

Nearest postcode: EH10 6JF | Grid reference: NT 24463 70256 | what3words/ports.woof.liner

An event for the Scottish Geology Festival www.scottishgeologytrust.org/festival/, one of two linked walks exploring the igneous rocks of Edinburgh. See also Igneous rocks of Edinburgh: Arthur’s Seat.